This was a 9 week EdX course offered by Caltech (Professor Antonio Rangel). This was the toughest course I have taken so far. I just scraped through and got my certificate. In spite of the frustration it caused, I think it was well worth it. I understood so many concepts that I was not aware of such as dead weight loss, Pigouvian tax, impact of government policies on consumer surplus, producer surplus. The calculus part is that difficult (it does involve some partial derivatives, but is is mostly single variable calculus) but requires a lot of thinking. Right now I have three more ongoing MOOCs, Virology (How viruses cause disease) from Columbia U, Electricity and Magnetism from Rice U, and Engineering systems in motion: dynamics of particles and bodies from Georgia Tech. The last course involves a lot of vector analysis and a little bit of vector calculus. E&M from Rice involves a lot of integral calculus, the course culminated in theory of electromagnetic waves which does invo